On his first touchdown, an 8-yard run with 2 minutes, 38 seconds gone in the game, Jack carried both teammate sand opponents into the end zone. But he set up his second on an unusual 24-yard run.

UW’s Tre Watson forced Jack to fumble but the ball rolled forward for about 20 yards. The Huskies’ Shaq Thompson tried to secure it but it slipped out of his grasp. The Bruins’ Brandon Willis finally recovered the ball at UW’s 25-yard line.

Two plays later, Jack burst through right guard for his second touchdown with 4:18 left in the first quarter. UW tried to stand him up at the goal line to keep Jack from scoring his third touchdown 2:55 into the second quarter. The tactic failed.

Jack perhaps made his biggest offensive contribution in the third period, after the Huskies narrowed their deficit to 27-24 on Cyler Myles’ 1-yard pass to Austin Seferian-Jankins.

On the ensuing drive, Jack converted two third-down opportunities before scoring on a 2-yard run that extended UCLA’s lead to 34-24 with 6:44 left in the quarter.

Jack rushed for 60 yards, 36 in the first quarter. He also made five tackles and deflected one pass for the game.

“It’s quite a burden,” Mora said. “He had 12 carries tonight. You combine that with all the defensive snaps he played, that’s hard. He plays on (special) teams, too.

As a result, Mora feels reluctant to rely on Jack’s offensive potential.

“Myles is a weapon,” Mora said. “But you just can’t go crazy with him because if you do, then his effectiveness on both sides of the ball begins to decline.

“It’s kind of a dance. You’ve got to decide how much you can use him without hampering his ability to be effective doing what we’re asking him to do. He’s an outstanding linebacker. He’s as good a linebacker as you’re going to find in America for a freshman.”

Nevertheless, Mora is willing to dance.

“We’re going to use him,” the coach said. “He’s 18. He recovers quickly. He’s got a big heart and he wants his team to win.”